▎ 摘　　要

NOVELTY - Layered coating lithium ion battery negative sheet involves coating graphene coating slurry on the copper foil current collector to control the lateral development direction of the expansion of the silicon material, suppressing the expansion rate and preventing the active material from falling off. USE - Method for layered coating lithium ion battery negative sheet. ADVANTAGE - The method enables to layered coat lithium ion battery negative sheet has highexpansion rate, low circulation and coulombic rate, effectively inhibits the silicon material expansion, controls the silicon material expansion direction, prevents the silicon material expansion caused by the SEI film repeatedly cracking problem, improves the lithium ion cathode sheet specific capacity, solves the problem that the graphite cathode material.